What would cause Windows Media Player to stop playing .avi files?

We have a Vista laptop and a XP Laptop as well and for whatever reason it will not play a specific .avi file.  Haven't tried any other .avi files because I need it to play this one at this time. We can play it on our Windows 7 workstations but we need it to play on a laptop needed for a presentation.  What do I need on that laptop that is missing keeping it from playing that video?
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Darren SharplesSystems SpecialistCommented:
try to install vlc player from http://www.videolan.org/vlc/


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dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
Quite possibly the machine doesn't have the right codecs.

Try either the Klite Codec pack http://www.free-codecs.com/download/k_lite_codec_pack.htm (Note that there are a number of packs offered).

Or the CCCP pack http://www.cccp-project.net/ which is a more streamlined basic pack than the Klite pack.
First step that I would do is to install the next free software G-Spot:

That will identify what codecs you have installed and what codec was used for encoding.
Then you just download and install the required codec to watch the video.
A good player is also KMPlayer
cwilleAuthor Commented:
perfect - you were the first to respond so we tried your solution first - and it worked great - you saved our presentation.  Thanks.
Darren SharplesSystems SpecialistCommented:
no probs, glad to help
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